A big section of this is about neoreactionaries not being connected to LessWrong or readers of SlateStarCodex as they were "distinct and well-defined groups, neither of which particularly liked each other" and claiming that suggesting otherwise is basically a slander invented by the target of the article.
On the other hand, there was a question posted in the SlateStarCodex sub Reddit that asks "Why are there so many neoreactionaries in this sub?” and an answer, from someone who doesn't seem (like several other people answering) to be particularly averse to NeoReactionaries is:
> Anyway the reason is that neoreaction developed in the same Bay Area libertarian circles as LessWrong with a wide degree of community overlap
https://www.reddit.com/r/slatestarcodex/comments/9xm2p8/why_...